Here are the corrections for the underlined parts:

1. **D. in** should be **A. at** ("in weekends" should be "at weekends").
2. **C. do** should be **B. does** ("and do morning exercise" should be "and does morning exercise").
3. **A. interest** should be **B. interested** ("Michael is interest" should be "Michael is interested").
4. **D. this** should be **C. that** ("this Sunday" should be "that Sunday").
5. **D. environmental** is correct; no change is needed.
6. **D. happy** should be **C. happily** ("live happy" should be "live happily").

The correct options are indicated; some might require different adjustments based on context.